Correct Answer: Option C
1 woman's 1 day's work = 1/70
1 child's 1 day's work =1/140
(5 women + 10 children)'s day's work = (5/70 + 10/140)
=(1/14 + 1/14) = 1/7
So, 5 women and 10 children will complete the work in 7 days.
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